Zebra Loach

Adults reach 8–9 cm in length. Sexual dimorphism is not pronounced; females are usually slightly larger than males, especially during spawning season, though this rarely occurs in the aquarium. The body is dark with alternating diagonal bands of grey or brown and pale yellow. Sometimes the pattern includes not only stripes but also rings or spots, typically seen in hybrid specimens.

This fish is native to southern India, where it inhabits river systems flowing through Karnataka, Maharashtra, and Andhra Pradesh before emptying into the Bay of Bengal. It is usually found in shallow coastal zones down to 1.5 metres deep, among driftwood and dense aquatic vegetation.

These fish prefer to school in groups of at least 10 individuals. A group of 5 zebra loaches is acceptable. Kept singly, they may become aggressive toward other tank inhabitants. Avoid keeping them with very small fish or species with long fins. They may coexist with other loaches and catfish if the tank is spacious enough, and with similarly sized fish living in the middle water column or near the surface.

For a group of 5 fish, a minimum aquarium volume of 100 litres is recommended. Use a sandy substrate mixed with pebbles and large boulders. Include several pieces of driftwood imitating tree roots and branches, or other artificial shelters. Groups of shade-loving plants are also suitable. Lighting should be dimmed. Adding Indian almond leaves gives the water a brownish tint that mimics the natural habitat. The zebra loach prefers moderate water flow and requires clean, well-oxygenated water. In addition to a high-performance filter, perform a 30–35% water change weekly and regularly remove organic waste from the tank.

These are carnivorous fish. In nature they eat aquatic insects and larvae, small crustaceans, and other benthic zooplankton found in rivers. In the aquarium, offer sinking foods such as dry flakes, pellets, and frozen bloodworm, brine shrimp, and daphnia. Earthworm pieces or small molluscs can also be used. The diet should include plant-based supplements; otherwise these fish may begin to damage fine-leaved plants.

Successful breeding of zebra loaches in the home aquarium is extremely rare. They are bred commercially using hormonal injection.

Health problems in these fish arise only from injury or unsuitable conditions, which weaken the immune system and lead to various diseases. At the first sign of illness, check water parameters for excessive values or toxic substances such as nitrite, nitrate, or ammonia. If problems are found, correct all parameters before beginning treatment.

When selecting a zebra loach, choose specimens at least 5 cm long, as younger fish are often weaker and adapt poorly to new conditions. A healthy fish should be active, constantly exploring the substrate, and socializing with its kind. Avoid specimens showing signs of emaciation, sunken bellies, or skin damage. Check carefully for signs of infection, such as white spots on the body or fins indicating ich. Watch behaviour: healthy loaches are curious and mobile, while lethargy or constant attempts to hide in the corner indicate stress or illness. Make sure the fish has undamaged sensory barbels around the mouth, as these are essential for foraging in the substrate. Since this species is prone to stress during transport and when water parameters change, buy from reputable sources where fish are kept in clean, well-aerated tanks. Always quarantine new fish to avoid introducing parasites into the main aquarium.